Something fast rolling, reasonably light and with some robustness (Rocket Ron need not apply) to side walls

Hopefully somebody will have some next to the rocking horse poop

Cheap would be great!

https://www.ribblecycles.co.uk/wtb-rang ... e-black-1/
New, obviously but a good price and rangers roll incredibly well, as well as being a pretty good all round tyre. My 29+ ones are the light version which are a bit weedy but these are the 'tough' version so should be ok.